01-08-2018 01:38 PM - edited 03-01-2019 06:20 PM
Hello,
I have just added a network to my layer 3 switch. The new network is doing multicast, and I beleive that is what is causing high CPU usage. When i disconnect the network from the port, CPU goes down.
I do not see any packet drops, no queues maxed out, no reason for the high CPU basically. Below is a diagram of the network.
Attached are some outputs from basic troubleshooting
Let me know if more information is needed.
01-08-2018 01:48 PM
01-08-2018 02:33 PM
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 28 WS-C3560G-24TS 12.2(55)SE10 C3560-IPBASEK9-M
01-09-2018 08:31 AM
Could it be the switch is not able to handle multicast?
Doing some more research, I am seeing the bod hop counter go up pretty quickly.
#sh ip traffic | i bad hop
3179 format errors, 0 checksum errors, 8098138 bad hop count
#sh ip traffic | i bad hop
3179 format errors, 0 checksum errors, 8098146 bad hop count
#sh ip traffic | i bad hop
3179 format errors, 0 checksum errors, 8098147 bad hop count
#sh ip traffic | i bad hop
3179 format errors, 0 checksum errors, 8098149 bad hop count
#sh ip traffic | i bad hop
3179 format errors, 0 checksum errors, 8098151 bad hop count
#sh ip traffic | i bad hop
3179 format errors, 0 checksum errors, 8098155 bad hop count
#sh ip traffic | i bad hop
3179 format errors, 0 checksum errors, 8098157 bad hop count
#sh ip traffic | i bad hop
3179 format errors, 0 checksum errors, 8098158 bad hop count
#sh ip traffic | i bad hop
3179 format errors, 0 checksum errors, 8098161 bad hop count
#sh ip traffic | i bad hop
3179 format errors, 0 checksum errors, 8098161 bad hop count
Could this mean I need to increase the TTL on the multicast packet?
Thanks
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide